In the type 3’s variant world, the only way to retain the stock engine hatch height would be to make a custom inlet maifold to reduce the height of the engine.

With my notchback it’s more like a Karmann Ghia now with the rear boot/trunk area as the engine bay. Fare play not only for keeping a Type 4 on the road but the STI transplant also.... hats off to you sir!

In my project, I have difficulty finding suitable drive shafts.
Unlike the Beetle or Bulli with Subaru transmission, the installation position is much lower and therefore I need shorter drive shafts.
Even the shortest ones available (Type3 automatic, left shaft) are still a bit too long.
You can cut drive shafts.
The special company that does that, only cuts hollow drive shafts. All VW or Porsche drive shafts I would like to use, are made of full material.